If you're a AAA subscriber, you get more benefits than just roadside assistance. According to pharmacist and redditor redheadhappy, you can get discounts on medication as well:

I work at a pharmacy and AAA is the best discount program we use. I will take a certain percentage off the case price of the medication.

This may seem a little absurb, but it's true. AAA actually advertises 50% off, and you can see it pictured above. These discounts seem on par with prescription club memberships that you can get at most drugstores, but if you already pay for AAA for your vehicle you already have those benefits without the additional cost.